59.5 In.H-W 4.5 In.L Aluminum Backdraft Damper, Damper Application Backdraft, For Nominal Duct Diameter 60 in, Frame Material Galvanized Steel, Number of Panels 2, Maximum Air Velocity 2000 fpm, Overall Height 59 1/2 in, Rough Opening Diameter 60 in, Rough Opening Shape Square, Fits Fan Diameter 60 in, For Duct Shape Square, Free Area 21.9 sq ft, Overall Width 59 1/2 in, Frame Material Thickness 20 ga, Overall Length 4 1/2 in, Frame Depth 2 in, Rough Opening Length 60 in

For use in roof curbs, ductwork, and wall collars when using a fan or power roof ventilator, this backdraft damper features mill-finish aluminum louvers, stainless steel pivot pins and rivets, and nylon bushings.<br /><br /> Item: Backdraft Exhaust Damper<br /> Type: No Flange, Horizontal Mount<br /> Damper Size (In.): 59-3/4 X 59-3/4<br /> Overall Size (In.): 59-3/4 X 59-3/4<br /> Max. Velocity (FPM): 2000<br /> Construction Material: G-90 Galvanized Steel Frame and Aluminum Blades<br /> Includes: Pre-punched Conduit Hole Knock-out and Felted Edges For Quiet Operation<br />